Type USF Ultra-Stable Low TC Ultra-Precision Film Resistors
2Pages

Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 e-mail: caddock@caddock.com • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html © 2004 Caddock Electronics, Inc. CADKDOC Type USF Ultra-Stable Low TC Film Resistors Zero Nominal TC — Maximum Absolute TC to 2 ppm/°C, -40°C to +85°C ref. to +25°C Absolute Tol. to ±0.01%, Resistance Range 50 Ohm to 25 Megohm, Voltage Ratings up to 2500 Volts Type USF 300 Series Ultra-Stable Resistors • ZERO Nominal TC — Max. Absolute TC: 5 ppm/°C, -40°C to +85°C, referenced to +25°C Type USF 200 Series Ultra-Stable Resistors • Constructed with two selected USF 300 Series Resistors bonded back to back to achieve outstanding low Absolute Temperature Coefficient performance. The resistors are to be connected in parallel on the circuit board. • ZERO Nominal TC — Max. Absolute TC: 2 ppm/°C, -40°C to +85°C, referenced to +25°C The USF Ultra-Stable Low TC Ultra-Precision Film Resistors were developed to meet the requirements for increasing performance for resistors in high performance analog electronics. Utilizing Caddock proprietary resistance film systems, the Type USF resistors provide the Lowest TC with the Widest Resistance Range and the Highest Voltage Ratings available in the industry. • Resistance Range 50 ohm to 25 Megohm. • Temperature Coefficient -40°C to +85°C, referenced to +25°C 200 Series — ZERO Nominal TC — Maximum Absolute TC 2 ppm/°C 300 Series — ZERO Nominal TC — Maximum Absolute TC 5 ppm/°C • Tolerance: ±0.01% or ±0.10%. • Specific standard resistance values are available that are most commonly required in high accuracy analog design. These values were selected and optimized for produceability and performance. • 300 Series “matched pairs” are available with ratio TC as tight as 0.5 ppm/°C. Contact Applications Engineering. • Ceramic package provides cool operation. Type USF Ultra-Stable Resistors are offered in standard resistance values that are most commonly used in precision analog design. These standard resistance values can be used in precise amplifier gain setting, precise resistor bridge circuits, precise transducer sense circuits, and precise voltage dividers with up to 2500 volt input voltage. Extremely Low Power Coefficient (Wattage Coefficient): Type USF resistors are constructed with an aluminum oxide ceramic sandwich which provides great thermal conductivity. The ceramic sandwich package very effectively minimizes the power coefficient drift. Power coefficient is the resistance drift due to temperature rise in the element caused by the power (wattage) dissipation in the resistor where the self-heating temperature rise of the resistor element results in TC drift (temp. rise in °C, times the temperature coefficient of the resistor). In the USF package, heat is pulled away from the resistance material efficiently by this ceramic sandwich package construction. Plastic molded Low TC foil resistors cannot provide this outstanding benefit since the plastic impedes the flow of heat, causing greater temperature rise at the resistor element and greater self-heating related resistance drift due to power dissipation. The USF 200 Series resistors provide a new level of performance with near ZERO TC, very low power coefficient, wide resistance range, and higher voltage ratings than is offered by other resistor technologies. W attage@ +85°CMaximumContinuousOper. VoltageTemperatureCoefficientUSF3400.330.75ADDimensions inches (mm)5 ppm/°CModel Number3001,400USF370USF3710.752,500Min.Max.Resistance20 Meg50 Ù10 Meg990 K25 Meg19.8 MegUSF2702 ppm/°CUSF2712 ppm/°CUSF2402 ppm/°C .600 ±.020(15.24 ±.51)1,4002,5003000.750.750.33 .375 ±.020(9.53 ±.51) .500 ±.020(12.70 ±.51)C .500 ±.020(12.70 ±.51) .500 ±.020(12.70 ±.51) .500 ±.020(12.70 ±.51)B .750 ±.020(19.05 ±.51) 1.500 ±.020(38.10 ±.51) 1.500 ±.020(38.10 ±.51) 1.500 ±.020(38.10 ±.51) 1.500 ±.020(38.10 ±.51)Fig.22211110 Meg50 Ù5 Meg990 K10 Meg9.9 Meg .375 ±.020(9.53 ±.51) .750 ±.020(19.05 ±.51) 1.350 ±.020(34.29 ±.51).425 Max.(10.8 Max.).550 Max.(13.97 Max.) 1.350 ±.020(34.29 ±.51).550 Max.(13.97 Max.) .600 ±.020(15.24 ±.51) 1.350 ±.020(34.29 ±.51) 1.350 ±.020(34.29 ±.51).395 Max.(10.03 Max.).520 Max.(13.21 Max.) .520 Max.(13.21 Max.)5 ppm/°C5 ppm/°C 200 Series and 300 SeriesNew Page 1 of 2 28_IL134.1004

Sales and Corporate Office 1717 Chicago Avenue Riverside, California 92507-2364 Phone: (951) 788-1700 Fax: (951) 369-1151 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 e-mail: caddock@caddock.com • web: www.caddock.com For Caddock Distributors listed by country see caddock.com/contact/dist.html © 2004 Caddock Electronics, Inc. CADKDOCAB.50 ±.125(12.70 ±3.18).032 DIA.(.81 DIA.).200 ±.020(5.08 ±.51)C(seated height)D.160 ±.030(4.06 ±.76)USF 200 Series Circuit Board Connection Note: The Type USF 200Series Resistor must...